File:A distinctly disorganised dwarf.jpg

本预览的尺寸：800 × 579像素。其他分辨率：320 × 232像素 | 640 × 463像素 | 1,024 × 741像素 | 1,280 × 926像素。

原始文件（1,280 × 926像素，文件大小：431 KB，MIME类型：image/jpeg）

本文件并非来自中文维基百科，而是来自维基共享资源。请参阅维基共享资源上的详细描述、讨论页、页面历史、日志。

维基共享资源是一个储存自由版权作品的项目。您可以向此项目作出贡献。

摘要

描述A distinctly disorganised dwarf.jpg	English: Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the Universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group. UGC 4459’s diffused and disorganised appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the centre of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process.
日期	2016年3月28日, 06:00:00
来源	http://www.spacetelescope.org/images/potw1613a/
作者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla)

许可协议

署名

ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.

Conditions:

The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.

本文件采用知识共享署名 4.0 国际许可协议授权。

署名: ESA/Hubble

您可以自由地：

共享 – 复制、发行并传播本作品
修改 – 改编作品

惟须遵守下列条件：

署名 – 您必须对作品进行署名，提供授权条款的链接，并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名，但不得以任何方式表明许可人认可您或您的使用。

文件历史

点击某个日期/时间查看对应时刻的文件。

	日期/时间	缩⁠略⁠图	大小	用户	备注
当前	2016年3月29日 (二) 08:43		1,280 × 926（431 KB）	Jmencisom	User created page with UploadWizard

文件用途

以下页面使用本文件：

不规则星系

全域文件用途

以下其他wiki使用此文件：

ar.wikipedia.org上的用途
- مجرة غير منتظمة
de.wikipedia.org上的用途
- PGC 24050
en.wikipedia.org上的用途
- Irregular galaxy
es.wikipedia.org上的用途
- Galaxia irregular
gl.wikipedia.org上的用途
- Galaxia irregular
my.wikipedia.org上的用途
- ပုံစံအတည်တကျမရှိ ဂလက်ဆီ
sr.wikipedia.org上的用途
- Неправилна галаксија

元数据

此文件中包含有扩展的信息。这些信息可能是由数码相机或扫描仪在创建或数字化过程中所添加。

如果此文件的源文件已经被修改，一些信息在修改后的文件中将不能完全反映出来。

提供者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla)
来源	ESA/Hubble
使用条款	Creative Commons Attribution 4.0 International License
简短标题	A distinctly disorganised dwarf
图像标题	Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the Universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group. UGC 4459’s diffused and disorganised appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the centre of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process.
数据生成日期时间	2016年3月28日 (一) 06:00
使用软件	Adobe Photoshop CC 2014 (Windows)
著作权状况	著作权状况未设置
原始文件唯一ID	xmp.did:ddd73821-01f3-0a4d-b202-65c97b594119
联系信息	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei M√ºnchen, , D-85748 Germany
关键词	UGC 4459
IIM版本	4

File:A distinctly disorganised dwarf.jpg

摘要

许可协议

说明

此文件中描述的项目

描绘内容

版权状态

版权所有

许可协议

知识共享署名4.0国际 ^{简体中文（已转写）}

成立或创建时间

28 3 2016

多媒体类型

image/jpeg

校验和 ^{简体中文（已转写）}

b952984de2d39fe87588e65a4e67dca2675bed8c

数据大小 ^{简体中文（已转写）}

441,154 字节

高度

926 像素

宽度

1,280 像素

文件历史

文件用途

全域文件用途

元数据

摘要

许可协议

说明

此文件中描述的项目

知识共享署名4.0国际 简体中文（已转写）

28 3 2016

image/jpeg

校验和 简体中文（已转写）

b952984de2d39fe87588e65a4e67dca2675bed8c

数据大小 简体中文（已转写）

441,154 字节

926 像素

1,280 像素

文件历史

文件用途

全域文件用途

元数据

知识共享署名4.0国际 ^{简体中文（已转写）}

校验和 ^{简体中文（已转写）}

数据大小 ^{简体中文（已转写）}